Assiqnob to the powers begulatob



June 20, 1933. M, o. SNEDI'KER Re. 18,875

HEATING 7 AND VE NTILATING UNIT Original Filed may 5, 1950 Reiaued June 20, 1933' UNITED STATES PATENT orFlcs Horror: 0. simmmm, or cmeaeo, unmo'rs, ASSIGNOR 'ro 'rrca' rownas uncommon columnar, or cnrcaeo, minors, A conronarrosr or rumors nmtrme um vnmrxm'rmo Originai No. 1,813,261, dated July 7, 1931, Serial No. 449,947, filed Kay 5, 1930. Reissue No. 18,523, dated July 12, 1982, Serial No. 602,072, filed March 30, 1932. This application for reissue filed November 12, 1932. Serial No. 642,368.

My invention relates to heating and ventilating devices and particularly to'a construction similar to that of my (Bo-pending application, Serial No. 449,946 filed May 5,

1930, Patent No. 1,866,178.

.In the disclosure of the application above.

not be without fault when an unusual temperature condition arises. For example,

when the outside temperature is comparatively mild, and when the room that is to be heated is at or above the predetermined desirable temperature, due to'the presence of a large number of persons, or to the admission of heat through-extraneous surces such as uninsulated risers, etc., the supply of heat to the casing radiator will be shut off and the controlling damper will beset to admit air from the outside. The entering air will be relatively cold, and, immediately upon being discharged from the casing under the action of the fan, will drop to the floor and cause a drafty condition. Particularly is this true as to persons who may be sitting adjacent to the ventilating unit, the cold air falling on their heads.

To avoid this condition, I have provided an adjunct to the apparatus, described 1n my.

copending application referred to, consisting of a second heat exchange element independently controlled and preferably located vertically beneath the main heatexchange' ele- -ment. Thecontrolling valve for the lower heat exchange element or radiator is actuated by a self-contained thermostatic device, the thermosensitive part of which is placed immediately above. the lower radiator and between the two radiators. This thermostat is set for a somewhat lower temperature than the thermostat that controls the main radiator. Thus in the eventof a condition such as heretofore described, the/entering air is not mal operating conditions, so long as the air withdrawn from the outside is below a certam temperature. I

The invention. will be more readily understood by reference to the accompanying drawmg, in which:

Fig. 1 is a sectional view on-the line 1l of Fig. 2 showing apparatus arranged in.ac-

cordance with my invention, and I Flg. 2 is an end view of the apparatus shown in Figs 1.

In the dra'wingI have illustrated a sheet I metal casing or cabinet lOhaving air outlet openings 11 in its top and two air inlet openings 1213 near the bottom and preferably on opposite sides of the casing. The screened opening 12 is designed to admit air to the openingfrom the room to be heated, while theopening 13 admits air from the outside. The admission of air from one or the other of the openings 1213 is controlled by a damper 14 adapted to be oscillated bya motor .15, through speed reducing means 16 and an arm 17 under the control ofa thermostat 18 preferably located as shown in the inlet openingl2 at a point near the lower end of the casing. The thermostat 18 is set so that whenever the temperature of the room near the floor is below apredetermined-point, say 65 degrees, the damper will be swung from the full line position of Fig. 2 to the dotted line position. This will result in circulation of the air in the room until the temperature is raised to the required point; when the temperature reaches that point the position of the damper will be reversed and air admitted through-the opening 13.

A motor 19 having a fan 20 oneach of the overhung ends of the armature shaft provides means for] inducing a flow of air,

through the casing. Thismotor is intended for constant operation throughoutthe periodwhen heating and ventilating are to be effected. Y

' as already described, the bulb 32 of which is j I placed between the two radiators and imme- Inithe upper part of the casing is a heat exchange element 21 the admission of steam to which is controlled by a valve 22 actuated by a well known form of self-contained ther mostat consisting of a bellows within the housing 23, a flexible tube 24 and a bulb 25. The bulb is mounted in a space between walls 26 that define an opening into the casing. A small space remains between the sides of the bulb and the walls 26 through which air from the room is drawn into the casing.

The apparatus just described is a duplicate of that described .in my copending application filed May 5, 1930. Y

In the modified construction ofthis application, I provide a second radiator 27 preferably'located immediately beneath'the radiator 21, both radiators having a common exhaust pipe 28 through the check valve 29. Steam is supplied to radiator 27 through a branch 30-from the supply pipe to the radiator 21 the valve 31 to the radiator 27 being actuated by a self-contained thermostat such diately above the radiator 27 By reason of this arrangement it will at no time be possible to discharge air to the room at a temperature lower than thepredetermined setting of the thermostat 32; in

other words, regardless of the temperature of the room, it will be possible to heat the incoming air to a predetermined temperature, say 65 degrees before admitting it. This may result in the elevation of the temperature of the room to a certain extent, but it will avoid the discharge of volumes of objectionable cold air.

From the foregoing description it will be apparent that the heating and ventilating to the space the temperature of which is to r be controlled and the other connected to a space outside of said temperature-controlled space, a pair of independent heat exchange elements in said casing, a thermostat for controlling the admission of air to said casing either from the inside or outside spaces, a second thermostat for controlling the admission ofheat to the lower of said heat exchange elements according to the temperature of the space between the superposed heat exchange elements, and a third thermostat trolling the admission of heat to said upper heat exchange element according to the temperature of the air inv said temperature controlled space.

said inlet openings being open to the room and the other inlet opening being connected to the outside air, two independent radiators in said casing, a thermostat for controlling the admission of air to said casing either from the room or from the outside, a blower for 'the combination of self-contained device comprising a casing having an air outlet opening and air inlet openings one ofthe latter connected to the room, the temperature of which is to be controlled and the other inlet opening being connected to the outside air,

two independent superposed radiators in said casing, a blower in said casing, means for controlling the admission'of air to said casing from the room or outside according to the temperature'of the room, means for controlling admission of heat to the lower of said radiators according to the temperature at a point immediately above said radiator, and means for controlling the temperature of the upper radiator according to the desired room temperature.

4. In heating and ventilating apparatus, the combination of self-contained device comprising a casing having an air outlet opening and air inlet openings, one of the latter connected to the room, the temperature of which is to be controlled and the other inlet opening being connected to the outside-air.

two independent superposedradiators in said casing,'a blower in said casing, means for controlling admission ofheat to the lowerofsaid radiators according tothe temperature at a point immediately above said radiator, said means being set at a temperature lower than the desired temperature of the room, and means for. controlling the temperature of the upper radiator according to the desired room temperature. 1

5. In heating and ventilating apparatus, the combination of a casing having an outlet-and air inlet openings one of the latter connected to the room, the temperature of which is to be controlled and the other mere- 2. In combination, a casing having an airoutlet opening and air-inlet openings one of ly being connected to theoutside air, independent superposed radiators within said casing, means for inducing travel of air -'controlling the admission of air to the casing nin) fromthe room or outside according-to the.

temperature of the air at a point'near the bottom of said casing, a second thermostat for controlling the admission of heat to the lowermost radiator accordingto the tempera ture at a point immediately above said radiator, and a third thermostat responsive to the airvtemperature of the-room for controlling the admission of heat to an upper radiator. 6. In heating and ventilating apparatus. the comLination of a self-contained device comprising a ,casing having an-air outlet opening and air inlet opeuings,'one of the latter connected to the room,- the temperature of which is to be controlled, and the other inlet opening being connected to the outside air, two independent superposed radiators in said casing, a blower in said casing. means for controlling admission of heat to the lower of said radiators according to the temperature of the air after it passes said lower radiator, and means for controlling the temperature of the upper radiator according to the' de sired room temperature.

7. In heating and ventilating apparatus,

the combination of a self-contained device comprising a casing having an air outlet opening and air inlet openings, one of the latter connected to the room, the temperature of which is to be controlled, and the other inlet opening being connected to the outside air, two independent superposed radiators in said casing, a blower in said casing, means for controlling admission of heat to one of saidradiators according to the temperature at a point immediatelv .above saidradiator, said means b ing set at a temperature lower than the desired temperature of the room, and means for controlling the temperature of the other radiator according tothe desired room temperature.

S. In combination. in a heating and ventilating apparatus of the unit type adapted to be located within the room to be heated, a casingharing a top outletopening, a pair of radiators arranged in adjacent vertically spaced relationship within said casing and immediately beneath said outlet opening, valves for each of said radiators, thermostatic means located between said radiators for controlling the valve of one radiator, and thermostatic means located remote from said radiators controlling the valve of the other radiator.

at a predetermined point immediately after it passes a heat exchange element, and then applying additional heat to said air after it passes said heat exchange element if required to bring the temperature up to the required temperature ofsaidenclosed space.

10. The method of heating an enclosed space by means of a unit heater and ventilator, located within the room to be heated and ventilated, which consists in automaticallyselecting the introduction therein of fresh air or air withdrawn from said space according to temperature conditions, maintaining the temperature of the introduced air at a predetermined degree after it passes a heat exchange element, said temperature being lower than the desired temperature of the enclosed space, and then applying additional heat to said air after it passes said heat exchange element according to the temperature of said enclosed spaced.

11. In heating and ventilating apparatus,

the combination of a self-contained device 10- cated within the room to be heated, compris ing a casing having an air outlet opening and air inlet openings, one of the latter open to the said room. and the other inlet opening being connected tothe outside air, two inde pendent superposed radiators in said'casing, a blower in said casing, means for controlling admission of heat to the lower of said radiaair inlet openings one of the latter open to the said room and the other inlet opening being connected to the outside air, two independent superposed radiators in said casing, a blower in said casing. means for controlling admission of heat to one of said radiators according to the temperature at a point immediately above said radiator, said means being set at a temperature lower than the de- 51 red temperature of the room. and means for controlling the temperature of the other ra-' diatoraccording to the desired room temperature.

13. In combination, in a heating and ventilating apparatus, constructed as a unit and adapted to be located within the space to be heated, a pairvof radiators arranged in adjacent vertically spaced relationship, valves for each of saidiradiators, thermostatic means located between said radiators for controlling the valve of one radiator, and thermostatic means located remote from said radiators controlling the valve of the other radiators. I a

14. In heating and ventilating apparatus, the combination of a self-contained device adapted to be located within the room to be heated, comprising a casing/havlng an air outlet opening and air inlet openings, one of the latter open to the said room, and theother inlet opening being connected to the outside air, two independent adjacent radiators 1n sald casmg. a blower 1n said casing, means 'for controlling admission of heat to one of said radiators according to the temperature of the air immediately after it passes said radiator, said means being set at a temperature .iower than the desired temperature of the room, and means for controlling the temperature of the other radiator according to the desired room temperature.

In testimony whereof I have aflixed my signature. t

-MORTON O. SNEDIKER. 

